Consider the following game: There are 3 players. Each player decides whether to work on a common project or not. The project is successful only if 2 or more players work on it. When the project is successful, each player obtains a payoff of 20. When the project is not successful, each player who works on the project obtains a payoff of -10 and each player who does not work on the project obtains a payoff of 0. Denoting by N the number of players who work on the project, determine what value or values of N are consistent with the Nash Equilibria of the game.